Enhance README (logo,badges...)
Enhance README (logo,badges...)

- Add CodeNarc logo
- Add more badges (contributors,stars,license, PRs Welcome)
- Add direct link to documentation
- Use Markdown headers
darxriggs/CodeNarc,darxriggs/CodeNarc,CodeNarc/CodeNarc,erdi/CodeNarc,erdi/CodeNarc,erdi/CodeNarc,erdi/CodeNarc,CodeNarc/CodeNarc